YKI is the name given to the National Certificate of Language Proficiency issued by the University of Jyväskylä and sanctioned by the Finnish Ministry of Education, following a standardized exam comprising oral and written parts that match Common European Framework of Reference for Languages (CEFR)

Common European Framework of Reference for Languages

The Common European Framework of Reference for Languages: Learning, Teaching, Assessment, abbreviated as CEFR, is a guideline used to describe achievements of learners of foreign languages across Europe and, increasingly, in other countries...

requirements and proficiency levels.

The YKI certification divides linguistic proficiency into three broad levels (lower, middle, upper) which can be divided into six levels that match CEFR levels.

CEFR	YKI
A1	1
A2	2
B1	3
B2	4
C1	5
C2	6

Foreigners must successfully pass the Middle level certification (levels 3 or 4) to qualify for Finnish citizenship.